Dust collector



April 9, 1946. R. l.. LINCOLN DUST COLLECTOR Filed May 10, 1944 2 Sheets-Sheet l April 9, 1946. R. LINCOLN DUST CQLLECTOR Filed May 10, 1944 2 Sheets-Sheet 2 Faand Llzrlcolrz.

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Patented Apr. 9, 1946' nus'r coLLEo'rolt` norma L. Lincoln. Dover, Maso., signor to n. F.

j Sturtevant Company, Boston, Mass.

Appuoouon may io, 1944, sonni no. 534.918

4 claim. (ci. isa-57) This invention relates to dust collectors and relates more particularly to filter typedust collectors and to the removal of the dust collected by the filters thereof.

Filter type dust collectors have the advantages of high collection eiliciencies and of compactness,

but it has been so difficult to remove the clust collected by the lters that it is the general practice to discard dust clogged iilters and to replace them with 'new ones. This practice results not only in increased expense due to the necessity for the frequent replacement of filters, but also in the inconvenience of shutting down the collectors at intervals for replacement of the lters.

This invention provides a iilter type dust collector in which the filters are continuously rotated during collection, and which are continuously cleaned by suction applied to their sur- A feature of this invention resides in the provision of a plurality of individual lter units, each composed of iilter cloth stretched over an outer circular rod and a pair of inner circular rods with provision for readily assembling any desired number of the illter units alongside each other on a rotary shaft'ior building up dust collectors of different capacities.

Another feature of the invention resides in the provision of a plurality of rotary iilter units hav ing V-shaped collecting surfaces together with suction nozzles having complemental V-shaped surfaces .for removing the dust from the illter surfaces.

Another feature of the invention resides in the provision of a plurality of rotary filter units, each provided with a suction nozzle, with provision for applying suction to the nozzles in succession.

Another feature ofthe invention resides in the provision of a plurality of filter units mounted on a rotary shaft, provided with individual suction nozzles mounted on a hollow shaft, through which suction is applied to the nozzles, the iilter units being removable `from one end' of the rotary shaft, and the suction nozzles being` rotatable on the hollow shaft forl permitting removal of the iilter units.

An object of the invention isto provide, inrtllter type dust collectors, for continuous lremoval of l the dust collected by the filters.

The invention will now bedescribed with reference to the drawings, of which: n

Fig. 1 is a'view in vertical section of a dust col- 'l ieotor embodying this invention;

Fig. 4 is an enlarged projected view illustrating thevapplication of the filter cloth to one of the filter units o! Figs. 1 and 2;

Fig. 5 is an enlarged view partially in section, I

illustrating how the filter cloth supporting rings are supported upon-plates attached to a rotary shaft;

Fig. 6 is an enlarged view in section of the end adjacent the suction blower, of the hollow shaft upon which the suction nozzles of Fig. 1 are mounted;

Fig. is a sectional view of one of the suction nozzles and is taken along the lines 'I-'l of Fig. 8;

Fig'. 8 is a sectional view along ythe lines 8 8 of Fig. 7, and

Fig. 9 is a sectional view along the lines 9-9 of Fig. 7. i

The dust collector illustrated has the vertical side walls III which converge in their lower por.. tions to form the vhopper II. the air inlet opening I2 at the upper ends of the walls I0.

One of the walls I0 has a large circular opening around which is attached by the bolts I6, the end plate I3. Theplate i3 supports the bearing i6 of the triangular plate 20, and the outer hoop as is mounted thereon, and is rotated'by the beit 25 attached to the other apex of the plate 20. The sheet 26 of lter cloth is stretched o ver. the hoops 2H and 25 and atached thereto between the hoops 24, by the lacing 21.

a As illustrated by Fig. 1, a number oitv filter units 23 may be supported alongside eachother by the plates I8. Larger or smaller collectors than the. one illustrated, may be provided by increasing o1"y decreasing, respectively, the number ofthe lter units 23 used. .y

I'lhe suction nozzles 30 are rotatably supported upon the hollow shaft 3| which extends through and is supported for rotation in the air seals 32 which are threaded into opposite side walls I0, of the collector.

One endv of the shaft 3| is closed and the pulley the walls IB the collector. The wheel `with the The collector has 2r llive radial arms 31 is attached to the shaft 33. 'Ihe wheel with the one Varm 33 is mounted on the shaft I and upon rotation of the shaft I3, the arm 33 strikes and rotates the arms 31 causing rotation of the hollow shaft 3|.

The shaft I5 is rotated by the pulley 43 which is attached thereto and by the belt 4| from a suitable speed reducing gear train 42 which may be driven by a conventional electric motor.

The suction nozzles 30 each has the extensions 43 which form therebetween a V-shaped opening, shaped complemental to the dust collecting surfaces of the filter units 23, the extensions 43 extending parallel to and closely spaced from the dust collecting surfaces when the nozzles and the illtervunits are assembled together as illustrated by Fig. 1. l

The nozzles 30 have the slots 44 which extend from the shaft 3| through the-extensions 43 as illustrated by Figs. '1, 8, and 9.

The other end of the hollow shaft 3| from that on which the pulley 3| is mounted, has mounted thereon the air seal 45 into which the pipe 46 extends. The pipe 43 connects tangentially with the secondary, cyclone type, dust collector 41.

The suction blower 43 driven by. the electric motor 43, has its inlet connected to the tube 50 which extends vertically into the center of the secondary collector 41, and has its outlet connected by the tube 5| into the interior of the main collector. 'I'he dust separated by the secondary collector 41 passes through the pipe 52 into the hopper of the main collector.

The hollow ,pipe 3| contains the staggered, horizontal slots 33 which are adapted, as thepipe 3| is rotated, to connect the slot 44 of each suction nozzle 33, successively with the suction applied to the interior of the pipe 3| by the blower 43. The rotary motion imparted to the pipe 3| through the arm 33 striking and rotating the arms 31, is intermittent so that the slots 53 in the pipe and the slots 44 in the nozzles are in alignment for sulcient periods of time for suction to be applied by each nozzle to the dust collecting surfaces of its respective fllter unit 23 during one complete revolution thereof.

The nozzles'3 have the aligned slots 55 into which the pins 33 extend for interconnecting the nozzles, whereby all of the nozzles may be rotated simultaneously about the pipe 3| from the position shown by the continuous lines of Fig. 3 to the position shown by the dashed lines of Fig. 3, for displacing the nozzles so that thev illter units 23 may be removed and replaced.

The units 23 may easily be removed and replaced by removal of the end plate I3, and the loosening of the screws 2| following which the units 23 may be removed from the plates I3 and new units inserted. v

'I'he wall I3 of the main collector opposite to that which supports the end plate |3, has a circular opening having a. diameter slightly less than the inner diameter of the filter units 23, and the air outlet duct 53 is attached to the main collector around this opening.

'I'he fan 53 driven by the motor 63 is supported in the duct 58 by the fairing 5| which in turn,

is supported from the duct by the spaced arms 62 which may be four in number.

In operation, the fan 53 draws air through the inlet |2 and through the filter surfaces of the filter units 23 and discharges it through the duct 33. Any dust inthe air entering the inlet I2 is collected on the filter surfaces of the units 23.

pair and supporting same from, and concentric Y a,sos,ass

Thefllterunits arerotatd. asdcscribcdin the foregoing, and much of the dust collected thereby is thrown of! by centrifugal force and fall-s into the hopper I The filter units are rotated by. rotation of the shaft l5, as described, so that their dust collecting surfaces pass, once each revolution, the slots 44 in the suction nozzles 33.

The blower 43 applies suction to the nozzles 30, in succession, as the shaft 3| is rotated as described in the foregoing. The dust removed .from the filter units by the suction from the blower 43', isA separated in the secondary collector, and discharged through the pipe 33 into the hopper y In the embodiment of the invention illustrated, there are ilve lter units 23 and the shaft 3| is so rotated and the slots 33 in the shalt 3| are so arranged, that each filter unit 23 has its surfaces cleaned once every five revolutions. This is sunlcient to keep the filter cloth clean and since the vacuum blower applies suction to only one nozzle at a time, its size is not large. and the power it consumes is relatively small.

While one embodiment of the invention has been described for the purpose of illustration, it should be understood that the invention is not limited to the exact apparatus and arrangement of apparatusillustrated, as modifications thereof may be suggested by those skilled in the art without departure from the essence of the invention.

What is claimed is:

1. A dust collector unit comprising a pair of substantially similar circular hoops, a third circular hoop having a larger diameter than said' hoop having a larger diameter than said hoops,

a rotary shaft, means spacing the hoops of said with, said shaft and supporting said third hoop between said hoops of said pair and concentric with same, a sheet of lter cloth stretched over said hoops, a suction nozzle having portions straddling said third hoop and extending to points adjacent the hoops of said pair, means forrotating said shaft for revolving said cloth past said nozzle, and means for applying suction to said nozzle for removing dust from said cloth.

3. A dust collector unit comprising a pair of substantially similar circular hoops, a third hoop having a larger diameter than said hoop, a plurality of triangular plates attached at their apices to said hoops,` means supporting said plates from said shaft, and a'sheet of filter cloth stretched over said hoops.

4. A dust collector unit comprising a pair of substantially similar circular hoops. a third hoop having a larger diameter than said hoops, a plurality of triangular plates attached at their apices to said hoops, a plurality of plates attached to 

